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P3485 Engine Diagnostic Code

On 1999 and later P3485 engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

P3485 engine code provides below are generic codes that may not apply to all vehicles.
Car manufacturer uses specific P3485 DTC code that are different
from the codes shown below. Foreign vehicles may also use DTC codes
different from the generic Engine Diagnostic codes.

P3485 Diagnostic Trouble Code Meaning And Solution

P

3

4

85

Powertrain Problem

MFG - Manufacturer Specific

Auxiliary Emission Controls

85 Engine Fault Code

Starting letter P diagnostic code shows that there are problems in engine, transmission and emissions systems.
If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes so you have to check your engine diagnostic code tool.
If your vehicle is an older model with a non-electronic Auxiliary Emission Controls, you can check the distributor
cap to see whether the spark is getting from there to the coil and on to the spark plugs.

Don't forget ! If your P3485 engine code not resolved on
and there are trouble codes in your computer, your vehicle will not pass an OBD 2
emissions test. The light must be off and there must be no codes in memory to pass an OBD 2
emissions test. In addition, all of the OBD II self-monitors that check for faults must have run and
completed without finding any further problems to pass the test.